Cleanup namespace usage in Source/web/*.h

Source/web/ExternalDateTimeChooser.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * SUCH DAMAGE.
  */
 
 #ifndef ExternalDateTimeChooser_h
 #define ExternalDateTimeChooser_h
 
 #if !ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 #include "platform/DateTimeChooser.h"
 
 namespace blink {
-class DateTimeChooserClient;
-}
-
-namespace blink {
 
 class ChromeClientImpl;
+class DateTimeChooserClient;
 class WebString;
 class WebViewClient;
 
-class ExternalDateTimeChooser FINAL : public blink::DateTimeChooser {
+class ExternalDateTimeChooser FINAL : public DateTimeChooser {
 public:
-    static PassRefPtrWillBeRawPtr<ExternalDateTimeChooser> create(ChromeClientImpl*, WebViewClient*, blink::DateTimeChooserClient*, const blink::DateTimeChooserParameters&);
+    static PassRefPtrWillBeRawPtr<ExternalDateTimeChooser> create(ChromeClientImpl*, WebViewClient*, DateTimeChooserClient*, const DateTimeChooserParameters&);
     virtual ~ExternalDateTimeChooser();
 
     // The following functions are for DateTimeChooserCompletion.
     void didChooseValue(const WebString&);
     void didChooseValue(double);
     void didCancelChooser();
 
 private:
-    ExternalDateTimeChooser(blink::DateTimeChooserClient*);
-    bool openDateTimeChooser(ChromeClientImpl*, WebViewClient*, const blink::DateTimeChooserParameters&);
+    ExternalDateTimeChooser(DateTimeChooserClient*);
+    bool openDateTimeChooser(ChromeClientImpl*, WebViewClient*, const DateTimeChooserParameters&);
 
     // DateTimeChooser function:
     virtual void endChooser() OVERRIDE;
 
-    blink::DateTimeChooserClient* m_client;
+    DateTimeChooserClient* m_client;
 };
 
 }
 #endif
 
 #endif